move-semantics

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Why do some people use swap for move assignments?

For example, stdlibc++ has the following: unique_lock& operator=(unique_lock&& __u) { if(_M_owns)[详细]

2023-03-20 08:20 分类：问答
When will a C++11 compiler make RVO and NRVO outperform move semantics and const reference binding?

Consider the case when \"whole\" objects with move semantics enabled are returned from functions, as with std::basic_string<>:[详细]

2023-03-16 04:23 分类：问答
Conditional compilation for move operations

How can I check whether my compiler supports rvalue references or not? Is there a standard preprocessor macro, or do different compilers have different macros? Ideally, I would want to write this:[详细]

2023-03-15 12:08 分类：问答
Stealing inside the move constructor

During the implementation of the move constructor of a toy class, I noticed a pattern: array2D(array2D&& that)[详细]

2023-03-15 11:58 分类：问答
Move or Named Return Value Optimization (NRVO)?

Lets say we have the following code: std::vector<int> f() { std::vector<int> y; ... return y; }[详细]

2023-03-10 03:01 分类：问答
What kinds of types does qsort not work for in C++?

std::sort swaps elements by using std::swap, which in turn uses the copy constructor and assignment operators, guaranteeing that you get correct semantics when exchanging the values.[详细]

2023-03-09 00:28 分类：问答
Do compilers automatically use move semantics when a movable object is used for the last time?

I\'ve been studying rvalue references lately and came to a conclusion that it\'s quite advantageous t开发者_如何学运维o use pass-by-value everywhere where complete copy of an object will be made (for[详细]

2023-03-07 11:06 分类：问答
Are value parameters implicitly moved when returned by value?

Consider the following function: Foo foo(Foo x) { return x; } Will return x invoke the copy constructor or the move constructor? (Let\'s leave NRVO aside here.)[详细]

2023-03-05 20:22 分类：问答
Is there any case where a return of a RValue Reference (&&) is useful?

Is there a reason when a function should return a RValue Reference? A t开发者_开发技巧echnique, or trick, or an idiom or pattern?[详细]

2023-02-28 15:14 分类：问答
Correct use of `= delete` for methods in classes

Is the following snipplet correct for un-defining all otherwise generated methods and constructors for a class?[详细]

2023-02-25 19:07 分类：问答